(19)

(11)

EP 0 109 392 A1

(12)

(43) Date of publication: 30.05.1984 Bulletin 1984/22 (21) Application number: 82901954.0 (22) Date of filing: 17.05.1982

(51) International Patent Classification (IPC):  G11B 23/ 03( . ) (86) International application number: PCT/US1982/000662 (87) International publication number: WO 1983/004135 (24.11.1983 Gazette 1983/27)

(84) Designated Contracting States: DE FR GB NL (71) Applicant: DATA PERIPHERALS Sunnyvale, CA 94086 (US)	(72) Inventor: EDWARDS, Roy J. San Jose, CA 95132 (US)